Fitness trainers and instructors typically do the following: Demonstrate or explain how to perform various exercises and routines to minimize injuries and improve fitness. Watch clients do exercises to ensure that they are using correct technique. Provide options during workouts to help clients feel successful. Fitness coaches help people develop healthy habits that contribute to emotional and social well-being in addition to physical fitness coach. While personal trainers' work can address their clients' overall wellness, these professionals' main focus is on exercise and workout programs.